[R] Info on SPATSTAT window and maps

[Roger Bivand]

On Wed, 4 Apr 2007, Giuseppe Brundu wrote:

> I wonder if there is any tutorial explaining, step by step, how to convert a 
> (georeferenced) map boundary (from esri shape-file) into a Spatstat window, 
> for performing the analysis of marked point patterns surveyed inside that 
> map. Any help on the subject will be really appreciated.

Doing RSiteSearch("shapefile owin") shows that this is possible. The 
current route is:

library(spatstat)
library(maptools)
your_sp <- readShapePoly("your.shp")
your_sp1 <- as(your_sp, "SpatialPolygons")
your_owin <- as(your_sp1, "owin")
plot(your_owin)
pp <- runifpoint(500, your_owin) 

but you may need extra steps, for example to merge polygons or to remove
small polygon artefacts. Other functions in maptools would let you create
a ppp object from a SpatialPointsDataFrame, if you need that too.

You might also consider looking at the R-sig-Geo list for questions of 
this kind.

> 
> Giuseppe Brundu
> 
> (University of Sassari, Italy)
> 
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> and provide commented, minimal, self-contained, reproducible code.
> 

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no